Flow in the large rivers around the world have been affected by reservoir management, irrigation or inter-basin diversions. This has threatened aquatic species by habitat fragmentation and degradation. Chinook Salmon along with other anadromous fish in Pacific Northwest are in the high risk for extinction because of habitat fragmentation and degradation.
Juvenile rearing and spawning habitat for Chinook Salmon were simulated with habitat models based on flow hydraulics (i.e., water depths and velocity) simulated with a two dimensional (2D) hydrodynamic model in a meter-scale grids for two river systems (Bear Valley Creek and Lemhi River) located in the state of Idaho. The Lemhi River flow is highly regulated to fulfill irrigation demands, whereas the Bear Valley is relatively natural. A habitat Suitability Index (SI) was compared between the two rivers to quantify impacts of flow regulations on aquatic habitat using one-way permutation test of independence and test of ANOVA using permutation.
The Bear Valley Creek had higher average SI than in the Lemhi River for Juvenile rearing habitat. The average SI differences were significant (at α = 0.05) for all months except in May and June. In contrast to the Juvenile rearing habitat, SI for spawning habitat in Lemhi River were higher than in the Bear Valley Creek. The differences were significant (at α = 0.05) for all months of the year except in March. Therefore, impacts of flow regulation on salmonid depends on species and life stages. Furthermore, regulated rivers may have better habitat than in natural river systems. Therefore, impacts of flow regulations on salmon habitat quality depend on species and their life stages rather than if the system is regulated or natural.
|Commitee:||Fries, Ryan, Zhou, Jianpeng|
|School:||Southern Illinois University at Edwardsville|
|School Location:||United States -- Illinois|
|Source:||MAI 82/7(E), Masters Abstracts International|
|Subjects:||Water Resources Management|
|Keywords:||Habitat, Juvenile, Modeling, Quality, Spawning, Suitability Index|
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